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Abstract. Full-dimensional Integrated Networks such as Space-Air-Ground Integrated Network (SAGINet) are considered an encouraging concept, unfortunately, they are exposed to a wide range of attacks due to their high dynamic, self-organizing, distribution and time-varying characteristics. We believe that scheming a dependable trust generator can mitigate a large variety of attacks. In this paper we propose a mathematical interpretation approach that extracts an accurate reputation value from the cluster. The proposed reputation generator is powered by the objective listening log and the authentication log. The reputation measurement is more realistic since it uses the link quality estimation to exact the reputation index. The trust system exploits the reputation index to detect and prevent attacks and exploits the mutual reputation to serve for the pathrater and network optimization.